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You more than likely have a blown channel. Use the diode checker on a DVM and chack each amplifier output for a short untill you find the bad channel. Once you have found it, you will need to replace both outputs and all of the trasistors in that circuit. You will also need to check your low ohm resistors and your emmiter resistor as well.

Without a schematic, you can take it apart and look around, and check any fuses you find. Sometimes, fuses are used in the form of "fusible links", which are very low ohm resistors in the input circuits to amplifiers, or in the power feeds to them. They're hard to identify without a schematic since they look like a small, metal film resistor, but they're usually about 1 ohm. If you're good at the resistor color coding, you can read and measure any you suspect as being one, and possibly locate it.
Otherwise, sometimes the main transistors in that amplifier circuit can go bad, or some other discrete component. In that case, you have to get a schematic and oscilloscope to figure it out.
Find your output to the front main speakers, and try to identify the part of the circuit that leads to it, to help narrow your search.
If this doesn't work, it will, unfortunately, have to be serviced. Check with a local tv repair shop, or contact Harman Kardon Support:
Hopefully, you will find a bad fuse or link.
Good luck, and hope this helps

Assuming that the system is properly installed and was working ok before, the problem is usually a blown output amplifier in one channel and the receiver disconnects the speakers to avoid damaging them. In this case, professional repair is required.

Check for transistors that read 0 or look like they got cooked,check the main fuse and if the fuse is blown,there's a reason so dont replace the fuse and turn it on just to blow another one. I would also check the audio amplifiers,usually they are STK's and are epensive (around 70-80$ a piece) and could take a while being they are manufacturer backordered. I would highly discourage using any import amplifiers as they are very low quality and fail within the first month or so.

Should it be lightning damage look around where the power cord plugs in,there may be 2 or 4 rectangular resistors that are open, (reads infinite in a resistance scale) those are easy replacements. Diodes are also a common factor,any that read 0 are usually bad unless they are close to a coil or transformer.

you do not have +17v and -17v on transformer board the top two fusible resistors are blown and the cap between them needs to be replaced as this cap probably shorted and caused resistors to blow. easy fix

It is going into protect mode. It is a common problem, but is not an easy problem to fix. It will go into protect for 3 main reasons. I work at an authorized Denon service center and have repaired many of these models, so I know what I am telling you is correct.

Reason 1

The receiver has a blown channel. This will require the replacement of many parts. The output transistors, supply resistors, driver transistors, and a capacitor in the driver circuit of the affected channel. It is usually the channel that is located closest to the display board on the main heat sink.

Reason 2

A bad voltage regulator in the power supply. It has several voltage regulators all on their own small heat sinks. It is usually ref # IC101 or ref # IC102. IC101 is a positive 15 volt regulator and IC102 is a negative 15 volt regulator. More often than not, it is the negative regulator that has gone bad.

Reason 3

The amplifier circuit has a 10 ohm resistor that supplies a high voltage to it and that resistor opens up and must be replaced. It is ref # R184. It is a 10 ohm 1 watt resistor.

Those are the 3 main reasons for your problem. It is not an easy unit to fix, but it is well worth the cost of a repair considering how much these receivers cost to purchase a new one. If you do not have the proper tools to fix this unit, please do yourself a favor and have a service center fix it for you. You will need a multimeter, soldering iron, solder, solder wick, and a # 2 phillips screwdriver. You will also need to isolate whcih of these 3 problems is causing the unit to go into protect. If you have a multimeter I can help you with it, but you still need the soldering equipment and must be skilled at using it.

How do you know it is specifically that resistor? I suppose you have schematics or something that is telling you R531 may be an issue. If a resistor is blown it will likely be black or discolored somehow.

I know that a couple of you have had the same problem with the blowing 0.47 ohm resistors. I had responded quite a wile back, but forgot to make any updates. Kostiko is correct about the problem relating to these two 0.47 ohm resistors being blown. In my case on two different Haman Kardon models, this was true, but there could also be another issue. What i have found is even after replacing these resistors, the problem appeared to still be there. What was happening was that right after turning the receiver on, the resistors would blow again. What you need to do is replace the two small ceramic disc style capacitors on the same pcb as the fusible resistors, as they could be shorted as in my case. You could remove these capacitors completely, or replace them with a similar size of the same type, as they are really just there for filtering higher frequency noises from the power supply. You can check them with your multimeter first. They shouldn't shorted even in situe. I forget the size, but they are approximately 100 nano farads. Good luck. I have done this to my AVR135, and it has been running great for about 6 months now.